This has been a trouble spot, is that right, in the Sunni triangle for some time?

NPR: U.S. Envoy Describes Troop Withdrawal

Beth's husband, Private E-2 Luigi Pratt, drove Army trucks on convoys through Iraq's Sunni Triangle.

NPR: Waiting and Dreading: Families in War Time

But while the British troops learn new tricks and teach old ones in the Sunni triangle, they will leave a gap behind.

ECONOMIST: British troops face fiercer fights in Iraq

Turkey's actions deprived the coalition with a mechanized thrust into the Sunni Triangle area of Iraq-a powerful thrust that could have done much to inhibit the development of the insurgency there.

CENTERFORSECURITYPOLICY: Turkey's cozy business with Iran

According to that official, the insurgents no doubt have considerable command and control in Sunni areas, but so far, the official says, there seems to be no single insurgent leader who can control all of the Sunni triangle.

NPR: Command and Control of the Iraq Insurgency

Lieutenant Colonel Richard Welch spent 18 months in Iraq starting in January of last year, and his job was to act as a liaison between the US military and Iraq's religious and tribal leaders, including those in the Sunni triangle.

NPR: Drawing Iraq's Sunnis into the Political Process